JP6163149B2 - Manufacturing method of electric wire with terminal - Google Patents

Description

The present invention relates to a method for manufacturing a terminal-attached electric wire .

  Conventionally, as an electric wire with a terminal, the thing of patent documents 1 is known, for example. In this case, a terminal is crimped to an electric wire including a core wire composed of a plurality of strands and a core wire exposed from the electric wire. A terminal has a crimping | compression-bonding part crimped | bonded so that it may wind around the outer side of a core wire. The wire and the terminal are electrically connected by being crimped so that the crimping portion is wound around the outside of the core wire. In the manufacture of the electric wire with a terminal, the surface of the element wire constituting the core wire is roughened by applying ultrasonic vibration to the core wire before the terminal is crimped to the core wire. If the strands whose surfaces are roughened rub against each other during crimping of the terminals, the new surfaces of the strands are exposed and it is easy to ensure electrical connection between the strands. As a result, it becomes easy to suppress the electrical resistance between the electric wire and the terminal.

JP 2011-82127 A

  However, it has been found that even if ultrasonic vibration is applied to the core wire before crimping the terminal to the core wire as in Patent Document 1, the electrical resistance between the electric wire and the terminal may not be sufficiently reduced.

  In such a case, if the core wire is further compressed at the time of crimping, the electrical resistance is reduced, but if the core wire is compressed too much, the strands constituting the core wire are disconnected.

This invention is completed based on the above situations, Comprising: It aims at providing the manufacturing method of the electric wire with a terminal by which the electrical resistance between an electric wire and a terminal was reduced.

  The present invention is a method of manufacturing a terminal-attached electric wire comprising: an electric wire having a core wire composed of a plurality of strands; and a terminal having a crimping portion that is crimped around the core wire, wherein the core wire is subjected to ultrasonic vibration. And a second step of crimping the crimping portion on a region where ultrasonic vibration of the core wire is applied, wherein the first step is configured to connect the core wire of the electric wire with terminal to the second step. When the wire is further compressed after the process, the core wire leaves the compression allowance by the crimping in the second step so that the resistance between the wire and the terminal is stabilized until the element wire of the terminal-attached wire is disconnected. Gives ultrasonic vibration.

  First, by applying ultrasonic vibration to the core wire in the first step, the surfaces of the plurality of strands constituting the core wire are roughened.

  Next, in the second step, the core wire is compressed by the crimping portion, so that the plurality of strands rub against each other. Then, the strands whose surfaces are roughened rub against each other, so that the oxide film formed on the surface of the strands is scraped and a new surface (metal surface) of the strands is exposed. When the newly-exposed surfaces of the exposed strands come into contact with each other, a plurality of strands are electrically connected.

  Also, when the core wire is compressed by the crimping part, the oxide film formed on the surface of the strand is scraped to expose the new surface of the strand, and the exposed new surface of the strand is electrically connected to the crimping portion. To do. Thereby, the electrical resistance between an electric wire and a terminal can be reduced.

  Furthermore, according to the present invention, in the first step, ultrasonic vibration is applied to the core wire, leaving the crimping margin of the crimping part in the second step. In the crimping allowance, when the core wire of the terminal-attached electric wire after the second step is further compressed, the electric resistance between the electric wire and the terminal is stabilized until the wire of the terminal-attached electric wire is disconnected. Is defined as By applying ultrasonic vibration to the core wire leaving the crimping allowance defined as above, the oxide film on the surface of the core wire is removed by the crimping part, and the electrical resistance between the strands is reduced while suppressing the disconnection of the strands. Can be reduced. As a result, the electrical resistance between the wire and the terminal can be reduced.

  Note that “after the second step” is defined as after the second step is completed and after the electric wire with terminal is completed. After this 2nd process, the case where the electric wire with a terminal is put in the distribution process is included, and the case where the electric wire with a terminal is actually used is also included.

  In addition, the resistance between the electric wire and the terminal is stable, even if the degree of crimping the crimping portion to the core wire is changed in the second step, the electric resistance between the electric wire and the terminal is substantially constant. In addition to some cases, it also includes cases where the change in electrical resistance is relatively small.

  As embodiments of the present invention, the following embodiments are preferable.

  The first compression rate defined by (cross-sectional area of the core wire after the first step / cross-sectional area of the core wire before the first step) × 100 (%) is preferably 85% or more. Note that decreasing the first compression rate means high-compression of the core wire, and increasing the first compression rate means low-compression of the core wire.

  If the first compression rate is less than 85% and the core wire is highly compressed, the compression allowance in the second step cannot be secured, which is not preferable.

  The first compression rate is preferably 95% or less.

  When the core wire is low-compressed with the first compression ratio larger than 95%, the surface of the wire cannot be sufficiently roughened, so that the electrical resistance between the plurality of wires can be sufficiently reduced. Disappear. As a result, among the plurality of strands, a strand located near the center in the radial direction of the core wire may not be able to participate in electrical connection with the crimping portion of the terminal. As a result, the electrical resistance between the electric wire and the terminal cannot be sufficiently reduced, which is not preferable.

  The second compression ratio defined by (cross-sectional area of the core wire after the second step / cross-sectional area of the core wire before the first step) × 100 (%) is preferably 50% or more.

  By setting the second compression rate in the second step to 50% or more, the crimping allowance in the second step can be ensured reliably. Thereby, the electrical resistance value between an electric wire and a terminal can be reduced reliably.

In addition, the above-mentioned 2nd compression rate is a final parameter | index which shows the degree of compression of the core wire in the completed electric wire with a terminal. For this reason, just before the core wire of the electric wire with terminal is further compressed after the second step and the element wire of the electric wire with terminal is disconnected, the core wire is in a higher compression state than after the second step. That is, when the compression rate before disconnection immediately before the strand breaks is defined as (cross-sectional area of the core wire just before the strand breaks / cross-sectional area of the core wire before the first step) × 100 (%),
2nd compression rate> compression rate before disconnection.

  The strand is preferably made of aluminum or an aluminum alloy.

  Thus, when the core wire is made of aluminum or an aluminum alloy aluminum alloy, an insulating film such as an oxide film is relatively easily formed on the surface of the core wire. This aspect is effective when an insulating film is easily formed on the surface of the core wire.

  In a state where the crimping part is crimped to the core wire, it is preferable that 20 or more of the plurality of strands are crimped to the crimping part.

  When the core wire has 20 or more strands, there is a possibility that the strand does not come into contact with the crimping portion in the radially inner region of the core wire. In this way, when the number of strands is 20 or more, the strands located inside the core wire in the radial direction can be electrically connected to the crimping portion by electrically connecting the strands. it can.

The present invention is also a method for manufacturing a terminal-attached electric wire comprising: an electric wire having a core wire composed of a plurality of strands; and a terminal having a crimping portion that is crimped around the core wire. A first step of applying sonic vibration, and a second step of crimping the crimping portion on a region of the core wire subjected to ultrasonic vibration, wherein the first step includes the core wire of the terminal-attached electric wire as described above. In the case of further compression after the second step, leaving the compression allowance by the pressure bonding of the second step so that the resistance between the electric wire and the terminal is stable until the wire of the electric wire with terminal is disconnected, The core wire is subjected to ultrasonic vibration, and the first compression rate defined by (cross-sectional area of the core wire after the first step / cross-sectional area of the core wire before the first step) × 100 (%) is 85. % To 95%.

Further, the technology disclosed in the present specification is an electric wire with a terminal including an electric wire having a core wire composed of a plurality of strands, and a terminal having a crimping portion to be crimped around the core wire, When the core wire of the terminal-attached electric wire is compressed, the resistance between the electric wire and the terminal is stable until the wire is disconnected.

Further, the technology disclosed in the present specification is an electric wire with a terminal including an electric wire having a core wire composed of a plurality of strands, and a terminal having a crimping portion to be crimped around the core wire, It is manufactured by executing a first step of applying ultrasonic vibration to the core wire and a second step of crimping the crimping portion to a region where the ultrasonic vibration of the core wire is applied. The first step includes the terminal. When the core wire of the electric wire is further compressed after the second step, the resistance between the electric wire and the terminal is stabilized until the element wire of the electric wire with terminal is disconnected before the crimping of the second step. Ultrasonic vibration is applied to the core wire, leaving a compression allowance.

  The technology disclosed in the present specification includes an electric wire in which a core wire composed of a plurality of strands is covered with an insulating coating, and a terminal having a crimping portion that is crimped to the core wire exposed from the insulating coating. An electric wire with a terminal, wherein the core wire exposed from the insulating coating is compressed by application of ultrasonic vibration, and the crimping of the terminal in a region including the primary compression region. The pressure-bonded portion is further compressed by the pressure-bonding portion at a position different from the primary compression region between the secondary compression region and the insulating coating, which is further compressed by pressing the portion. Non-compressed region, and in the primary compression region, defined as (cross-sectional area of the core wire in the primary compression region / cross-sectional area of the core wire in the non-compressed region) × 100 (%) The first compression ratio is 85 (% -95%, and in the secondary compression region, the second compression defined as (cross-sectional area of the core wire in the secondary compression region / cross-sectional area of the core wire in the non-compression region) × 100 (%) The rate is preferably 50 (%) to 80%.

  When the first compression ratio is less than 85%, it is preferable that the crimping portion is crimped to the core wire to ensure electrical performance, because the mechanical strength cannot be sufficiently secured and the terminal-attached electric wire may be disconnected. Absent. On the other hand, when the first compression ratio exceeds 95%, the strands are not sufficiently in electrical contact with each other, and there is a possibility that an increase in electrical resistance cannot be sufficiently suppressed after the terminals are crimped. Therefore, it is not preferable. According to the present technology, a plurality of strands can be electrically connected by setting the first compression rate to 85% to 95%.

  Furthermore, according to the present technology, the first compression rate is set to 85% to 95%, and the second compression rate is set lower than the first compression rate in a state where the strands are electrically connected to each other. The crimping part is crimped to the core wire. Thereby, since a core wire is reliably compressed by a crimping | compression-bonding part, the electrical connection of a crimping | compression-bonding part and a core wire can be ensured.

  As described above, according to the present technology, a plurality of strands can be electrically connected to each other, and the core wire composed of the plurality of strands and the crimping portion can be reliably connected to each other. As a result, the electrical resistance between the electric wire and the terminal can be reduced.

  According to the present invention, the electrical resistance between the electric wire and the terminal can be reduced.

The side view which shows the electric wire with a terminal concerning Embodiment 1 of the present invention. Perspective view showing terminals The perspective view which shows the core wire exposed from the edge part of an electric wire The perspective view which shows the state after applying ultrasonic vibration to a core wire The perspective view which shows the state before mounting the core wire to which the ultrasonic vibration was added to a wire barrel Sectional view taken along line VI-VI in FIG. Sectional drawing which shows the state by which the core wire which has 19 strands was crimped | bonded to the wire barrel Sectional drawing which shows the state by which the core wire which has 71 strands was crimped | bonded to the wire barrel The graph which shows the relationship between the contact resistance which concerns on Experimental example 1 (1) -1 (6), and a 2nd compression rate. A photograph showing a cross section after execution of the first step and before execution of the second step for the core wire according to Experimental Example 1 (1) The graph which shows the relationship between the contact resistance which concerns on Experimental example 2 (1) -2 (6), and a 2nd compression rate. The graph which shows the relationship between the contact resistance which concerns on Experimental example 3 (1) -3 (6), and a 2nd compression rate A photograph showing a cross section after execution of the first step and before execution of the second step for the core wire according to Experimental Example 3 (1) The graph which shows the relationship between the contact resistance which concerns on Experimental example 4 (1)-4 (5), and a 2nd compression rate. A photograph showing a cross section after execution of the first step and before execution of the second step for the core wire according to Experimental Example 4 (1) The graph which shows the relationship between the contact resistance which concerns on Experimental example 5 (1) -5 (5), and a 2nd compression rate. A photograph showing a cross section after execution of the first step and before execution of the second step for the core wire according to Experimental Example 5 (1) The graph which shows the relationship between the contact resistance which concerns on Experimental example 6 (1) -6 (5), and a 2nd compression rate. The graph which shows the relationship between the contact resistance which concerns on Experimental example 7 (1) -7 (4), and a 2nd compression rate. A photograph showing a cross section after execution of the first step and before execution of the second step for the core wire according to Experimental Example 7 (1) The top view which shows the electric wire with a terminal concerning Embodiment 2 of the present invention. The partially expanded sectional view which shows the electric wire with a terminal concerning Embodiment 3 of the present invention.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. The electric wire with terminal 10 according to the present embodiment includes an electric wire 11 and a female terminal 12 (an example of a terminal) connected to the terminal of the electric wire 11. In the following description, the upper side in FIG. 1 is the upper side, and the lower side is the lower side. Further, the left side in FIG. 1 is the front and the right side is the rear. In the following description, for a plurality of members having the same shape, only one member may be assigned a reference numeral, and the other members may be omitted.

(Wire 11)
As shown in FIG. 1, in a state where it is connected to the female terminal 12, it extends in the front-rear direction. As shown in FIG. 1, the electric wire 11 is formed by surrounding the outer periphery of a core wire 13 with an insulating coating 14. The core wire 13 may be made of any metal such as aluminum, aluminum alloy, copper, copper alloy, or the like as necessary. In the present embodiment, aluminum or aluminum alloy is used.

  The core wire 13 is formed of a stranded wire obtained by twisting a large number of strands 15. The insulation coating 14 is peeled from the end of the electric wire 11 by a predetermined length, so that the core wire 13 is exposed from the tip of the insulation coating 14. The core wire 13 according to the present embodiment includes 20 or more strands 15. The number of the strands 15 may be the number determined by a standard such as JIS (for example, 37), or may include the number of strands 15 different from the standard.

  As shown in FIG. 4, in this embodiment, the some strand 15 which comprises the core wire 13 exposed from the electric wire 11 is pinched | interposed by a pair of jigs 16 and 16 from the up-down direction, and is given ultrasonic vibration. It is like that. More specifically, the upper jig 16 directly sandwiches the core wire 13 from above (the direction indicated by the arrow B) and the lower jig 16 directly from the lower (the direction indicated by the arrow C). It has become. The strand 15 is formed with a roughened region 17 whose surface is roughened by applying ultrasonic vibration from the jig 16 and rubbing each other. The roughened region 17 is formed on the surface of each strand 15 located in a region where the strands 15 are roughened. The plurality of strands 15 may be welded together by applying ultrasonic vibration.

(Female terminal 12)
The female terminal 12 is formed by press-molding a metal plate material (not shown) into a predetermined shape. As a metal which comprises the female terminal 12, arbitrary metals, such as copper, copper alloy, aluminum, aluminum alloy, iron, and an iron alloy, can be selected as needed. In this embodiment, copper or a copper alloy is used.

  A plating layer (not shown) is formed on the surface of the female terminal 12. As a metal constituting the plating layer, any metal such as tin or nickel can be selected as necessary. In the present embodiment, a tin plating layer is formed.

  The female terminal 12 is formed with a pair of insulation barrels 18 that are crimped so as to be wound around the insulating coating 14 of the electric wire 11 from the outside. At the left side of the insulation barrel 18 in FIG. 1, there is a wire barrel 19 (an example of a crimping portion) that is connected to the insulation barrel 18 and is crimped so as to be wound around the core wire 13 of the electric wire 11 from the outside. Is formed.

  As shown in FIG. 1, a connecting portion 20 is connected to the wire barrel 19 at the front (left side in FIG. 1) of the wire barrel 19 and is electrically connected to a mating terminal (not shown). Is formed. In the present embodiment, the counterpart terminal is a male terminal. The connecting portion 20 has a cylindrical shape, and a male terminal can be inserted into the cylinder. An elastic contact piece 21 is formed in the connecting portion 20, and the male terminal and the female terminal 12 are electrically connected by elastically contacting the elastic contact piece 21 and the male terminal.

  As shown in FIG. 2, a recess 23 is formed on the contact surface 22 that contacts the core wire 13 in the wire barrel 19 of the female terminal 12. In the present embodiment, three recesses 23 are formed side by side in the direction in which the electric wire 11 extends (the direction indicated by the arrow A in FIG. 2).

  As shown in FIG. 1, a wire barrel 19 is crimped around the outer periphery of the core wire 13 exposed from the electric wire 11 so as to be wound around. In the present embodiment, the roughened region 17 is formed in a region that is slightly wider in the front-rear direction than the length dimension of the wire barrel 19 in the front-rear direction.

  As shown in FIG. 6, pressure is applied to the core wire 13 from the piece of the wire barrel 19 by being crimped so that the wire barrel 19 is wound around the core wire 13. Then, the insulating coating made of an oxide film or the like formed on the surface of the core wire 13 is broken, and the new surface (metal surface) of the core wire 13 is exposed, and the new surface and the contact surface 22 of the wire barrel 19 come into contact with each other. Thus, the electric wire 11 and the female terminal 12 are electrically connected. In FIG. 6, the shape of the wire 15 is omitted.

  In the present embodiment, the step of applying ultrasonic vibration to the core wire 13 is the first step, and the step of crimping the wire barrel 19 around the core wire 13 is the second step. In the first step, ultrasonic vibration is applied to the core wire 13 while leaving the allowance for crimping the wire barrel 19 in the second step. In this crimping allowance, when the core wire 13 of the electric wire with terminal 10 after the second step is further compressed, the electric wire between the electric wire 11 and the female terminal 12 until the wire 15 of the electric wire with terminal 10 is disconnected. It is defined that the resistance is to become stable.

  Note that “after the second step” is defined as after the second step is completed and after the terminal-attached electric wire 10 is completed. After this 2nd process, the case where the electric wire 10 with a terminal is put in the distribution process is included, and the case where the electric wire 10 with a terminal is actually used is also included.

  Moreover, even if the resistance between the electric wire 11 and the female terminal 12 is stable, even when the degree of crimping the wire barrel 19 to the core wire 13 is changed in the second step, the electric wire 11 and the female terminal 12 In addition to the case where the electric resistance between them is substantially constant, the case where the change in electric resistance is relatively small is also included.

In the present embodiment, in the first step of applying ultrasonic vibration to the core wire 13,
(Cross sectional area of the core wire after the first step / Cross sectional area of the core wire before the first step) × 100 (%)
The first compression rate defined in the above is set to 85% to 95%. A high first compression rate means low compression, and a low first compression rate means high compression.

  The cross-sectional area of the core wire before performing the first step was measured by cross-section cut observation.

  Moreover, the cross-sectional area of the core wire after performing the first step was measured by cross-section cut observation.

In the present embodiment, in the second step of crimping the wire barrel 19 to the core wire 13,
(Cross sectional area of the core wire after the second step / Cross sectional area of the core wire before the first step) × 100 (%)
The second compression rate defined by is preferably set to 50% to 80%, and more preferably 60% to 70%. A high second compression rate means low compression, and a low second compression rate means high compression.

  The cross-sectional area of the core wire after performing the second step was measured by cross-sectional cut observation.

  Then, an example of the manufacturing method of the electric wire 10 with a terminal is demonstrated. First, a metal plate material is pressed into a predetermined shape. At this time, you may form the recessed part 23 simultaneously.

  Then, the connection part 20 is formed by bending the metal plate material formed in the predetermined shape (refer FIG. 2). At this time, the recess 23 may be formed.

  Subsequently, the core wire 13 is exposed by peeling off the insulating coating 14 at the end of the electric wire 11 (see FIG. 3).

  Thereafter, as shown in FIG. 4, the exposed core wire 13 is sandwiched between a pair of jigs 16 and 16. In the present embodiment, the pair of jigs 16 and 16 are configured to directly sandwich the core wire 13 from the vertical direction in FIG. After sandwiching the core wire 13 with the jig 16, ultrasonic vibration is applied to the core wire 13 with the jig 16 (an example of a first step). Known conditions can be used as the conditions for ultrasonic vibration.

  By applying ultrasonic vibration to the core wire 13, the plurality of strands 15 constituting the core wire 13 rub against each other. Then, a roughened region 17 having a roughened surface is formed on the surface of the strand 15. Thereafter, the ultrasonic vibration is stopped, the pair of jigs 16 and 16 are separated from each other, and the core wire 13 is removed from the jig 16 and cooled (cooled).

  If ultrasonic vibration is further applied to the core wire 13 after the roughened region 17 is formed, the surfaces of the strands 15 are melted by frictional heat. In this case, the core wires 13 are allowed to cool, so that the strands 15 are welded together.

  As shown in FIG. 4, after the ultrasonic vibration is applied, the core wire 13 is formed in a flat shape in a direction (vertical direction in FIG. 4) in which the pair of jigs 16, 16 sandwich the core wire 13.

  As shown in FIG. 5, after applying ultrasonic vibration to the core wire 13, the portion of the core wire 13 including the roughened region 17 is placed on the wire barrel 19, and the insulating coating 14 is attached to the insulation barrel 18. The wire barrel 19 is crimped so as to be held from the outside of the electric wire 11 by being sandwiched from above and below by a pair of molds (not shown) while placed on the wire (an example of the second step). In the present embodiment, a pair of molds for crimping the wire barrel 19 is sandwiched between the core wire 13 formed in a flat shape from the direction intersecting the flat surface of the core wire 13. . The terminal-attached electric wire 10 is completed by executing the above steps.

  Then, the effect | action and effect of this embodiment are demonstrated. According to the present embodiment, when the ultrasonic vibration is applied to the core wire 13, the strands 15 constituting the core wire 13 rub against each other. As a result, the surfaces of the strands 15 rub against each other, whereby a roughened region 17 having a roughened surface is formed on the strands 15.

  When the wire barrel 19 is pressure-bonded to the core wire 13 made of the strand 15 in which the roughened region 17 is formed, the strands 15 are rubbed against each other due to the force applied by the wire barrel 19. Then, the roughened regions 17 formed on the surface of the strand 15 are rubbed with each other, so that the coating such as an oxide film formed on the surface of the strand 15 is peeled off. Then, the new surface of the strand 15 is exposed. The exposed new surfaces contact each other, whereby the wires 15 are electrically connected. Thereby, since the strand 15 located in the radial direction inner side of the core wire 13 can contribute to the electrical connection between the electric wire 11 and the female terminal 12, the electric current between the electric wire 11 and the female terminal 12 is provided. Resistance can be reduced.

  Furthermore, the newly formed surfaces that are in contact with each other adhere to each other to form an alloy, whereby a new insulating film such as an oxide film on the newly formed surface of the strand 15 is suppressed. Thereby, the electrical resistance between the electric wire 11 and the female terminal 12 can be maintained in a small state.

  The strands 15 are electrically connected to each other by welding. Thereby, when the core wire 13 is crimped, the wire 15 positioned on the radially inner side of the core wire 13 can surely contribute to the electrical connection between the electric wire 11 and the female terminal 12. The electrical resistance between 11 and the female terminal 12 can be further reduced.

  Further, when a force is applied to the core wire 13 by the wire barrel 19, the element wire 15 and the wire barrel 19 rub against each other. Then, the film such as an oxide film formed on the surface of the strand 15 formed on the surface of the strand 15 is peeled off. Then, the new surface of the strand 15 is exposed. When the exposed new surface and the wire barrel 19 are in contact with each other, the core wire 13 and the wire barrel 19 are electrically connected. Thereby, the strand 15 located in the radial inside of the core wire 13 and the wire barrel 19 can be electrically connected.

  As described above, in the first step, ultrasonic vibration is applied to the core wire 13 while leaving the allowance for crimping the wire barrel 19 in the second step. In this crimping allowance, when the core wire 13 of the electric wire with terminal 10 after the second step is further compressed, the electric wire between the electric wire 11 and the female terminal 12 until the wire 15 of the electric wire with terminal 10 is disconnected. It is defined that the resistance is to become stable.

  By applying ultrasonic vibration to the core wire 13 leaving the crimping allowance defined as described above, the wire barrel 19 removes the oxide film on the surface of the core wire 13 and suppresses the disconnection of the strand 15 while making a plurality of breaks. The electrical resistance between the strands 15 can be reduced. As a result, the electrical resistance between the electric wire 11 and the female terminal 12 can be reduced.

  In the present embodiment, the first compression rate defined by (cross-sectional area of the core wire 13 after the first step / cross-sectional area of the core wire 13 before the first step) × 100 (%) is 85% or more. Note that reducing the first compression rate means that the core wire 13 is highly compressed, and increasing the first compression rate means that the core wire 13 is low-compressed.

  If the core wire 13 is highly compressed by making the first compression rate smaller than 85%, it is not preferable because the compression allowance in the second step cannot be secured.

  In the present embodiment, the first compression rate is 95% or less.

  When the core wire 13 is low-compressed by making the first compression ratio larger than 95%, the surface of the strand 15 cannot be sufficiently roughened, so that the electrical resistance between the plurality of strands 15 is sufficient. It cannot be reduced. Then, the strand 15 located near the radial center of the core wire 13 among the plurality of strands 15 may not be able to participate in electrical connection with the wire barrel 19 of the female terminal 12. As a result, the electrical resistance between the electric wire 11 and the female terminal 12 cannot be sufficiently reduced, which is not preferable.

  In the present embodiment, the second compression ratio defined by (the cross-sectional area of the core wire 13 after the second step / the cross-sectional area of the core wire 13 before the first step) × 100 (%) is 50% or more. The

  By setting the second compression rate in the second step to 50% or more, the crimping allowance in the second step can be ensured reliably. Thereby, the electrical resistance between the electric wire 11 and the female terminal 12 can be reduced reliably.

In addition, the above-mentioned 2nd compression rate is a final parameter | index which shows the degree of compression of the core wire 13 in the completed electric wire 10 with a terminal. For this reason, just before the core wire 13 of the electric wire with terminal 10 is further compressed after the second step and the element wire 15 of the electric wire with terminal 10 is disconnected, the core wire 13 is in a higher compression state than after the second step. Yes. That is, when the compression rate before disconnection immediately before the strand 15 is disconnected is defined as (cross-sectional area of the core 13 immediately before the strand 15 is disconnected / cross-sectional area of the core 13 before the first step) × 100 (%). ,
2nd compression rate> compression rate before disconnection.

In the present embodiment, in the first step of applying ultrasonic vibration to the core wire 13,
(Cross sectional area of the core wire after the first step / Cross sectional area of the core wire before the first step) × 100 (%)
Is preferably set to 85% to 95%, more preferably 90%.

  When the first compression rate is higher than 95%, since the energy of ultrasonic vibration applied to the core wire 13 is reduced in the first step, the plurality of strands 15 are not sufficiently in electrical contact with each other. In addition, after the female terminal 12 is pressure-bonded, it is not preferable because an increase in electric resistance cannot be sufficiently suppressed.

  When the first compression ratio is smaller than 90%, the plurality of strands 15 are welded together, which is more preferable because the electrical resistance between the plurality of strands 15 can be further reduced.

In the present embodiment, in the second step of crimping the wire barrel 19 to the core wire 13,
(Cross sectional area of the core wire after the second step / Cross sectional area of the core wire before the first step) × 100 (%)
The second compression rate defined by is preferably set to 50% to 80%, and more preferably 60% to 70%. A large value of the second compression rate means low compression, and a small value of the second compression rate means high compression.

  By making the second compression rate smaller than 80%, the core wire 13 can be highly compressed. Thereby, since the core wire 13 is fully compressed by the wire barrel 19, the surface of the strand 15 and the wire barrel 19 can fully rub against each other. Thereby, since the electrical resistance of the core wire 13 and the wire barrel 19 can be made small enough, it is preferable.

  In the present embodiment, the core wire 13 is made of aluminum or an aluminum alloy. Thus, when the core wire 13 is made of aluminum or an aluminum alloy aluminum alloy, an insulating film such as an oxide film is relatively easily formed on the surface of the core wire 13. This embodiment is effective when an insulating film is easily formed on the surface of the core wire 13.

  A core wire 13 having 20 or more (37 in this embodiment) strands 15 is crimped to the wire barrel 19. In such a case, this embodiment is particularly effective because the plurality of strands 15 positioned on the radially inner side of the wire barrel 19 can be electrically connected to each other. This point will be schematically described below.

  As shown in FIG. 7, when there are 19 strands 115, each strand 115 has a portion that contacts the wire barrel 119 in a state where the wire barrel 119 is crimped to the core wire 113.

  On the other hand, as shown in FIG. 8, when the core wire 213 has 20 or more strands 215 (71 in FIG. 8), in the region I on the radially inner side of the core wire 213, the strand 215 May not come into contact with the wire barrel 219. That is, when the number of core wires 213 is 20 or more, the core wire 213 is formed into a plurality of layers when observed in a cross-sectional shape, and the outermost layer (first layer) strand 215 is the inner part of the wire barrel 219 after terminal crimping. The oxide film is removed by contact with the peripheral surface, and the electrical resistance is reduced. On the other hand, the layers (second layer and third layer) formed inside the outermost layer do not give ultrasonic vibration to the core wire 213. In this case, the strands 215 are in contact with each other, but the oxide film is not sufficiently removed, and the electrical resistance increases. Thus, when the number of the strands 215 is 20 or more, the strands 215 positioned inside the core wire 213 in the radial direction are electrically connected to each other by applying ultrasonic vibration. Can be electrically connected to the wire barrel 219.

(Description of Examples)
Below, the Example which applied this invention to the electric wire with a terminal is described. In the following description, Experimental Examples 3 (2) to 3 (6), 4 (2) to 4 (5), 5 (2) to 5 (5) are Examples, and Experimental Example 1 (1) -1 (6), 2 (1) -2 (6), 3 (1), 4 (1), 5 (1), 6 (1) -6 (5), 7 (1) -7 (4) Is a comparative example.

<Experimental example 1 (1)>
First, the metal plate material was pressed into a predetermined shape to form a female terminal.

  Subsequently, after the core wire was exposed by peeling off the insulation coating at the end of the electric wire, the core wire was sandwiched between a pair of jigs, and ultrasonic vibration was applied to the core wire. The first compression rate at this time was 99%.

  The conditions at this time were a pressing force of the jig of 13 bar, a frequency of 20 kHz, and an applied energy of 10 Ws. The equipment used is Mini-II manufactured by Schunk.

  Then, the wire barrel was crimped | bonded to the core wire by pinching | interposing a core wire with a pair of metal mold | die not shown from an up-down direction. Thereby, the electric wire with a terminal was created. The second compression rate at this time was 45%. Table 1 shows manufacturing conditions of the electric wire with terminal according to Experimental Example 1 (1).

  FIG. 10 shows an enlarged photograph of the cross section of the core wire after the execution of the first step and before the execution of the second step. In Experimental Example 1 (1), it can be visually recognized that the shape of each strand remains.

<Experimental Example 1 (2) to 1 (6)>
For Experimental Examples 1 (2) to 1 (6), a terminal-attached electric wire was produced in the same manner as Experimental Example 1 (1) except that the second compression rate in the second step was set to the value shown in Table 1. .

<Experimental example 2 (1)>
For Experimental Example 2 (1), a terminal fitting was produced in the same manner as Experimental Example 1 (1) except that the energy applied to the core wire in the first step was 30 Ws and the first compression ratio was 97%. Table 2 shows the manufacturing conditions of the electric wire with terminal according to Experimental Example 1 (1).

<Experimental example 2 (2) to 2 (6)>
For Experimental Examples 2 (2) to 2 (6), a terminal-attached electric wire was produced in the same manner as Experimental Example 2 (1) except that the second compression rate in the second step was set to the value shown in Table 2. .

<Experimental example 3 (1)>
For Experimental Example 3 (1), a terminal fitting was produced in the same manner as in Experimental Example 1 (1) except that the energy applied to the core wire in the first step was 40 Ws and the first compression rate was 95%. Table 3 shows the manufacturing conditions of the electric wire with terminal according to Experimental Example 3 (1).

  FIG. 13 shows an enlarged photograph of the cross section of the core wire after the execution of the first step and before the execution of the second step. In Experimental Example 3 (1), there is also a strand that can visually recognize that the shape remains, but it can also be visually recognized that there is also a strand that is formed by joining the strands together.

<Experimental Example 3 (2) to 3 (6)>
For Experimental Examples 3 (2) to 3 (6), a terminal-attached electric wire was produced in the same manner as Experimental Example 3 (1) except that the second compression rate in the second step was set to the value shown in Table 3. .

<Experimental Example 4 (1)>
For Experimental Example 4 (1), a terminal fitting was produced in the same manner as Experimental Example 1 (1) except that the energy applied to the core wire in the first step was 50 Ws and the first compression ratio was 90%. Table 4 shows the manufacturing conditions of the electric wire with terminal according to Experimental Example 4 (1).

  FIG. 15 shows an enlarged photograph of the cross section of the core wire after execution of the first step and before execution of the second step. In Experimental Example 4 (1), the roundness of the wires remains slightly, but it can be visually confirmed that most of the wires are joined together.

<Experimental Example 4 (2) to 4 (5)>
For Experimental Examples 4 (2) to 4 (5), a terminal-attached electric wire was produced in the same manner as Experimental Example 4 (1) except that the second compression rate in the second step was set to the value shown in Table 4. .

<Experimental example 5 (1)>
For Experimental Example 5 (1), a terminal fitting was produced in the same manner as in Experimental Example 1 (1) except that the energy applied to the core wire in the first step was 60 Ws and the first compression rate was 85%. Table 5 shows the manufacturing conditions of the electric wire with terminal according to Experimental Example 5 (1).

  FIG. 17 shows an enlarged photograph of the cross section of the core wire after execution of the first step and before execution of the second step. In Experimental Example 5 (1), it can be visually recognized that the strands are joined together.

<Experimental Example 5 (2) to 5 (5)>
For Experimental Examples 5 (2) to 5 (5), a terminal-attached electric wire was produced in the same manner as Experimental Example 5 (1) except that the second compression rate in the second step was set to the value shown in Table 5. .

<Experimental example 6 (1)>
For Experimental Example 6 (1), a terminal fitting was produced in the same manner as Experimental Example 1 (1) except that the energy applied to the core wire in the first step was 90 Ws and the first compression rate was 83%. Table 6 shows manufacturing conditions of the electric wire with terminal according to Experimental Example 6 (1).

<Experimental Examples 6 (2) to 6 (5)>
For Experimental Examples 6 (2) to 6 (5), a terminal-attached electric wire was produced in the same manner as Experimental Example 6 (1) except that the second compression rate in the second step was set to the value shown in Table 6. .

<Experimental example 7 (1)>
For Experimental Example 7 (1), a terminal fitting was produced in the same manner as in Experimental Example 1 (1) except that the energy applied to the core wire in the first step was 95 Ws and the first compression rate was 80%. Table 7 shows the manufacturing conditions of the electric wire with terminal according to Experimental Example 7 (1).

  FIG. 20 shows an enlarged photograph of the cross section of the core wire after execution of the first step and before execution of the second step. In Experimental Example 7 (1), it can be visually recognized that the strands are joined together.

<Experimental Examples 7 (2) to 7 (4)>
For Experimental Examples 7 (2) to 7 (4), a terminal-attached electric wire was produced in the same manner as Experimental Example 7 (1) except that the second compression rate in the second step was set to the value shown in Table 7. .

(Measurement of contact resistance between wire and terminal)
From the core wire 13 of the electric wire with terminal according to Experimental Examples 1 (1) to 7 (4) manufactured as described above, as shown in FIG. The arranged strand 15 was extended, and the electrical resistance between the strand 15 and the female terminal 12 was measured. For the measurement of contact resistance, a general-purpose resistance measuring device was used, and the measurement conditions were a four-terminal method. For each experimental example, the contact resistance was measured for 10 samples, and the average value was taken as the contact resistance value in the experimental example.

For each experimental example measured as described above, a graph showing the relationship between the contact resistance and the second compression ratio is shown in the figure as follows. In addition, the horizontal axis of the graph shown to each figure was made into the 2nd compression rate, and the vertical axis | shaft was made into contact resistance. Further, the graph shows the variation in the measured value of each sample in each experimental example with an error bar extending in the vertical direction.
FIG. 9: Experimental example 1 (1) to 1 (6)
FIG. 11: Experimental example 2 (1) to 2 (6)
FIG. 12: Experimental examples 3 (1) to 3 (6)
FIG. 14: Experimental examples 4 (1) to 4 (5)
FIG. 16: Experimental examples 5 (1) to 5 (5)
FIG. 18: Experimental examples 6 (1) to 6 (5)
FIG. 19: Experimental examples 7 (1) to 7 (4)

(Results and discussion)
<Experimental Example 1 (1) to 1 (6)>
As shown in Table 1, Experimental Examples 1 (1) to 1 (6) are comparative examples.

  As shown in FIG. 9, in Experimental Example 1 (1) in which the second compression rate is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 1 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 1 (2) to 1 (6), the contact resistance exceeds 0.1 mΩ, which is not preferable because the electrical resistance between the core wire and the terminal cannot be sufficiently reduced.

  Furthermore, in Experimental Examples 1 (2) to 1 (6), it was found that the variation in the contact resistance of each sample in each Experimental Example was relatively large. This is presumably because the first compression rate in the first step is 99% and the compression is relatively low, so that the wires are not sufficiently electrically connected. For this reason, it is not preferable for Experimental Examples 1 (2) to 1 (6) because the electrical connection reliability is relatively low.

  As shown in FIG. 10, in Experimental Examples 1 (1) to 1 (6), the wires are electrically connected in the state after the first step and before the second step. Connection is not fully made. For this reason, it is necessary to reduce the second compression rate in the second step to high compression. However, if the compression is excessively high, there is a concern that the strands may be cut as in Experimental Example 1 (1). It is.

<Experimental example 2 (1) to 2 (6)>
As shown in Table 2, Experimental Examples 2 (1) to 2 (6) are comparative examples.

  As shown in FIG. 11, in Experimental Example 2 (1) in which the second compression rate is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 2 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 2 (2) to 2 (6), the contact resistance exceeds 0.1 mΩ, which is not preferable because the electric resistance between the core wire and the terminal cannot be sufficiently reduced.

<Experimental Example 3 (1) to 3 (6)>
As shown in Table 3, Experimental Examples 3 (2) to 3 (6) are examples, and Experimental Example 3 (1) is a comparative example.

  As shown in FIG. 12, in Experimental Example 3 (1) in which the second compression ratio is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 3 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 3 (2) to 3 (5) in which the second compression ratio is 52% to 70%, the contact resistance is 0.1 mΩ or less, which is preferable.

  As shown in FIG. 13, in Experimental Examples 3 (1) to 3 (6), the wires are sufficiently formed in the state after the first step and before the second step. It is in an electrically connected state. The strand located inside the radial direction of the core wire and the strand positioned outside the radial direction of the core wire are electrically connected, and further, the strand positioned outside the radial direction of the core wire and the wire barrel By being electrically connected, the contact resistance between the core wire and the female terminal can be reduced.

<Experimental Example 4 (1) to 4 (5)>
As shown in Table 4, Experimental Examples 4 (2) to 4 (5) are examples, and Experimental Example 4 (1) is a comparative example.

  As shown in FIG. 14, in Experimental Example 4 (1) in which the second compression rate is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 4 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 4 (2) to 4 (5) in which the second compression ratio is 52% to 70%, the contact resistance is 0.1 mΩ or less, which is preferable.

  As shown in FIG. 15, in Experimental Examples 4 (1) to 4 (5), the wires are sufficiently formed in the state after the first step and before the second step. It is in an electrically connected state. The strand located inside the radial direction of the core wire and the strand positioned outside the radial direction of the core wire are electrically connected, and further, the strand positioned outside the radial direction of the core wire and the wire barrel By being electrically connected, the contact resistance between the core wire and the female terminal can be reduced.

<Experimental Example 5 (1) to 5 (5)>
As shown in Table 5, Experimental Examples 5 (2) to 5 (5) are examples, and Experimental Example 5 (1) is a comparative example.

  As shown in FIG. 16, in Experimental Example 5 (1) in which the second compression ratio is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 5 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 5 (2) to 5 (5) in which the second compression ratio is 52% to 70%, the contact resistance is 0.1 mΩ or less, which is preferable.

  As shown in FIG. 17, in Experimental Examples 5 (1) to 5 (5), the strands are welded to each other in a state after the first step and before the second step. It is in a state that has been Thereby, the strand located inside with respect to the radial direction of the core wire and the strand positioned outside with respect to the radial direction of the core wire are reliably electrically connected, and further, the strand positioned outside with respect to the radial direction of the core wire. By electrically connecting the wire barrel and the wire barrel, the contact resistance between the core wire and the female terminal can be reliably reduced.

<Experimental Example 6 (1) to 6 (5)>
As shown in Table 6, Experimental Examples 6 (1) to 6 (5) are comparative examples.

  As shown in FIG. 18, in Experimental Example 6 (1) in which the second compression rate is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 6 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 6 (3) to 6 (5), the contact resistance exceeds 0.1 mΩ, which is not preferable because the electrical resistance between the core wire and the terminal cannot be sufficiently reduced.

  In Experimental Example 6 (2) in which the second compression ratio was 52%, the contact resistance was a relatively low value of 0.1 mΩ or less, but this is not preferable for the following reason. In Experimental Examples 6 (1) to 6 (5), the first compression rate in the first step is 83%, which is relatively high compression. For this reason, the difference between the second compression rate in the second step and the first compression rate is relatively small. For this reason, when a wire barrel is crimped | bonded with respect to a core wire in a 2nd process, the deformation amount of a core wire will become comparatively small. Then, it becomes impossible for a core wire and a wire barrel to fully contact, and it is thought that the electrical connection reliability of a core wire and a wire barrel falls.

<Experimental Example 7 (1) to 7 (4)>
As shown in Table 7, Experimental Examples 7 (1) to 7 (4) are comparative examples.

  As shown in FIG. 19, in Experimental Example 7 (1) in which the second compression rate is 45%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, in Experimental Example 7 (1), the second compression rate is 45%, and the core wire is relatively highly compressed. Since some of the several strands which comprise a core wire are cut | disconnected and the cut | disconnected core wire falls from a wire barrel, there exists a possibility that a short circuit may generate | occur | produce, it is not preferable.

  In Experimental Examples 7 (3) to 7 (4), the contact resistance exceeds 0.1 mΩ, which is not preferable because the electrical resistance between the core wire and the terminal cannot be sufficiently reduced.

  In Experimental Example 7 (2) in which the second compression rate was 52%, the contact resistance showed a relatively low value of 0.1 mΩ or less. However, it is not preferable for the reasons described below. In Experimental Examples 7 (1) to 7 (4), the first compression rate in the first step is 80%, which is relatively high compression. For this reason, the difference between the second compression rate in the second step and the above-described first compression rate is further reduced as compared with Experimental Examples 1 (1) to 6 (5). For this reason, when a wire barrel is crimped | bonded with respect to a core wire in a 2nd process, the deformation amount of a core wire will become comparatively small. Then, it becomes impossible for a core wire and a wire barrel to fully contact, and it is thought that the electrical connection reliability of a core wire and a wire barrel falls.

  As shown in FIG. 20, in Experimental Examples 7 (1) to 7 (4), the strands are in a state after the first step and before the second step. Welded and united.

<Embodiment 2>
Next, the terminal-attached electric wire 32 according to the second embodiment of the present invention will be described with reference to FIG. The terminal according to the present embodiment is a so-called splice terminal 30 (an example of a terminal) that does not have the connection portion 20. As shown in FIG. 21, when connecting the core wire 13 of the two electric wires 11, the splice terminal 30 peels off the insulation coating 14 at the end portion of one electric wire 11 to expose the core wire 13, and the other one. For the electric wire 11, the insulation coating 14 is peeled off at the intermediate portion, the core wire 13 is exposed, and each of the two exposed core wires 13 is a part of a pair of wire barrels (an example of a crimping portion) 31. It is designed to caulk with one of each.

  In the present embodiment, 20 or more strands 15 are crimped to the wire barrel 31 in a state where the core wires 13 of the two electric wires 11 are crimped by the wire barrel 31. For example, when two electric wires 11 having 19 strands 15 are crimped together by the wire barrel 31, 38 strands 15 are crimped to the wire barrel 31.

<Embodiment 3>
Next, a terminal-attached electric wire 53 according to Embodiment 3 of the present invention will be described with reference to FIG. The insulation coating 14 is peeled from the end of the electric wire 11 by a predetermined length, so that the core wire 13 is exposed from the tip of the insulation coating 14. A wire barrel 19 is crimped to the outer periphery of the core wire 13.

  For example, the core wire 13 is formed with a primary compression region 50 in which the core wire 13 is compressed by sandwiching the core wire 13 with a pair of jigs and applying ultrasonic vibration.

  As shown in FIG. 22, the wire barrel 19 is crimped to a region including the primary compression region 50. Of the core wire 13, the primary compression region 50 compressed by applying ultrasonic vibration and the region further compressed by the wire barrel 19 is a secondary compression region 51. The entire region where the core wire 13 is compressed by the wire barrel 19 may be the primary compression region. Further, a portion that is not the primary compression region 50 may be included in the region in which the core wire 13 is compressed by the wire barrel 19.

  A non-compressed region 52 is formed in the core wire at a position between the secondary compression region 51 and the insulating coating 14 and at a position different from the primary compression region. The wire barrel 19 is not crimped to the non-compressed region 52. Further, no ultrasonic vibration is applied to the non-compressed region 52.

  In the present embodiment, the insulating coating 14, the non-compressed region 52, the first compressed region 50, and the second compressed region 51 are arranged in order in the direction from the insulating coating 14 to the female terminal 12 of the electric wire 11. ing.

The first compression rate of the core wire 13 in the primary compression region 50 is defined as follows.
(Cross sectional area of the core wire in the primary compression region / Cross sectional area of the core wire in the non-compression region) × 100 (%)
In the present embodiment, the first compression rate is 85 (%) to 95%.

Moreover, the 2nd compression rate of the core wire 13 in the secondary compression area | region 51 is defined as follows.
(Cross sectional area of the core wire in the secondary compression region / Cross sectional area of the core wire in the non-compressed region) × 100 (%)
In the present embodiment, the second compression rate is 50 (%) to 80%.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, the insulating coating 14, the non-compressed region 52, the first compressed region 50, and the second compressed region 51 are arranged in order in the direction from the insulating coating 14 to the female terminal 12 of the electric wire 11. ing. Thereby, the compression state of the core wire 13 is set so that it may become high compression in steps about the direction which the core wire 13 goes to the female terminal 12 from the insulation coating 14. FIG.

  First, the core wire 13 in the uncompressed region 52 is not subjected to ultrasonic vibration, and the wire barrel 19 is not crimped. For this reason, the core wire 13 in the non-compressed region 52 is in a state where it is not compressed at all.

  Next, the first compression rate in the primary compression region 50 is set to 85% to 95%. That is, the core wire 13 in the primary compression region 50 is in a higher compression state than the non-compression region 52.

  And the 2nd compression rate in the 2nd compression field 51 is set as 50%-80%. That is, the core wire 13 in the secondary compression region 51 is in a higher compression state than the primary compression region 50.

  Thus, the compression state of the core wire 13 does not change abruptly by setting the compression state of the core wire 13 to be in a high compression state step by step from the insulating coating 14 toward the female terminal 12. ing. Thereby, in the process of compressing the core wire 13, the damage which the core wire 13 receives can be reduced. As a result, it is possible to prevent the wire 15 constituting the core wire 13 from being disconnected, so that the electrical connection reliability between the female terminal 12 and the electric wire 11 can be improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) The core wire 13 in a state where the wire barrel 19 is crimped may have a configuration including 2 to 36 wires or 37 or more strands 15.

  (2) In the first embodiment, one electric wire 11 is connected to one female terminal 12, but the present invention is not limited to this, and two or more electric wires 11 are connected to one female terminal 12. It is good also as a structure.

  (3) If the roughening area | region is formed in the surface of a strand by giving an ultrasonic vibration, strands do not need to be welded mutually. Moreover, it is good also as a structure which crimps | bonds to the wire barrel, after loosening the strands once welded.

  (4) The pair of wire barrels 19 may be crimped to the core wire in an arrangement shifted from each other in the direction in which the electric wire 11 extends, and the wire barrel pieces branched into three or more are formed alternately from the left and right sides. Alternatively, only one wire barrel piece may be formed and crimped to the core wire 13, and the shape of the wire barrel may be any shape as necessary.

  (5) In the present embodiment, the terminal is the female terminal 12 having the cylindrical connection portion 20, but is not limited thereto, and may be a male terminal having a male tab, and a through hole is formed in the metal plate material. A so-called LA terminal may be used, and a terminal having an arbitrary shape can be used as necessary.

  (6) In the present embodiment, the electric wire 11 is a covered electric wire that covers the outer periphery of the core wire 13 with the insulating coating 14, but is not limited thereto, a shielded electric wire may be used, or a bare electric wire may be necessary. Any wire can be used depending on the case.

  (7) Although not shown, as the splice terminal 30 according to the second embodiment, the core wire 13 is exposed at the intermediate part of the two electric wires 11, and the exposed intermediate part is one of the pair of wire barrels 31. It is good also as a structure crimped | bonded by one.

  (8) In the first embodiment, the core wire 13 is sandwiched between the pair of jigs 16 and 16 from the vertical direction so as to be subjected to ultrasonic vibration. It may be sandwiched between a pair of jigs 16, 16, and may be configured to be sandwiched between a plurality of jigs 16 from any direction as necessary.

10: Electric wire with terminal 11: Electric wire 12: Female terminal (terminal)
13, 113, 213: Core wire 15, 115, 215: Elementary wire 16: Jig 17: Roughening region 19: Wire barrel (crimp part)
30: Splice terminal (terminal)

Claims (7)

An electric wire having a core wire composed of a plurality of strands, and a terminal having a crimping part that is crimped around the core wire,
A first step of applying ultrasonic vibration to the core wire;
A second step of crimping the crimping portion on a region of the core wire subjected to ultrasonic vibration,
In the first step, when the core wire of the electric wire with terminal is further compressed after the second step, the resistance between the electric wire and the terminal is stabilized until the element wire of the electric wire with terminal is disconnected. Thus, the manufacturing method of the electric wire with a terminal which gives the ultrasonic vibration to the said core wire leaving the compression allowance by the crimping | compression-bonding of the said 2nd process.   2. The terminal according to claim 1, wherein the first compression ratio defined by (cross-sectional area of the core wire after the first step / cross-sectional area of the core wire before the first step) × 100 (%) is 85% or more. Electric wire manufacturing method.   2. The terminal according to claim 1, wherein the first compression ratio defined by (cross-sectional area of the core wire after the first step / cross-sectional area of the core wire before the first step) × 100 (%) is 95% or less. Electric wire manufacturing method.   2. The terminal according to claim 1, wherein the second compression ratio defined by (cross-sectional area of the core wire after the second step / cross-sectional area of the core wire before the first step) × 100 (%) is 50% or more. Electric wire manufacturing method.   The said strand is a manufacturing method of the electric wire with a terminal as described in any one of Claims 1-4 which consists of aluminum or aluminum alloy.   The terminal according to any one of claims 1 to 5, wherein, in the state where the crimping part is crimped to the core wire, the crimping part is crimped with 20 or more of the plurality of strands. Electric wire manufacturing method. An electric wire having a core wire composed of a plurality of strands, and a terminal having a crimping part that is crimped around the core wire,
A first step of applying ultrasonic vibration to the core wire;
A second step of crimping the crimping portion on a region of the core wire subjected to ultrasonic vibration,
In the first step, when the core wire of the electric wire with terminal is further compressed after the second step, the resistance between the electric wire and the terminal is stabilized until the element wire of the electric wire with terminal is disconnected. Thus, leaving the compression allowance by the pressure bonding in the second step, and giving ultrasonic vibration to the core wire,
(Cross sectional area of the core wire after the first step / Cross sectional area of the core wire before the first step) × 100 (%) The first compression ratio defined by 85% or more and 95% or less Production method.

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